Usually that is not a joke (but you never know), it means she likes you. Apparently she sent you many signals that you did not notice, so she decided to maybe embarass herself to make you understand that she likes you.
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Receiving a flower from a girl could be a gesture of affection, friendship, or appreciation. It's important to consider the context of the gesture and the relationship you have with the person to understand the meaning behind it. You could reciprocate with a kind gesture, such as thanking her or returning the sentiment with a small gift.